1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.settings.bluetooth;
18 
19 import android.bluetooth.BluetoothAdapter;
20 import android.content.BroadcastReceiver;
21 import android.content.Context;
22 import android.content.Intent;
23 import android.content.IntentFilter;
24 import android.os.Handler;
25 import android.os.Message;
26 import android.provider.Settings;
27 import android.widget.CompoundButton;
28 import android.widget.Switch;
29 import android.widget.Toast;
30 
31 import com.android.settings.R;
32 import com.android.settings.WirelessSettings;
33 import com.android.settings.search.Index;
34 import com.android.settings.widget.SwitchBar;
35 
36 /**
37  * BluetoothEnabler is a helper to manage the Bluetooth on/off checkbox
38  * preference. It turns on/off Bluetooth and ensures the summary of the
39  * preference reflects the current state.
40  */
41 public final class BluetoothEnabler implements SwitchBar.OnSwitchChangeListener {
42     private Context mContext;
43     private Switch mSwitch;
44     private SwitchBar mSwitchBar;
45     private boolean mValidListener;
46     private final LocalBluetoothAdapter mLocalAdapter;
47     private final IntentFilter mIntentFilter;
48 
49     private static final String EVENT_DATA_IS_BT_ON = "is_bluetooth_on";
50     private static final int EVENT_UPDATE_INDEX = 0;
51 
52     private Handler mHandler = new Handler() {
53         @Override
54         public void handleMessage(Message msg) {
55             switch (msg.what) {
56                 case EVENT_UPDATE_INDEX:
57                     final boolean isBluetoothOn = msg.getData().getBoolean(EVENT_DATA_IS_BT_ON);
58                     Index.getInstance(mContext).updateFromClassNameResource(
59                             BluetoothSettings.class.getName(), true, isBluetoothOn);
60                     break;
61             }
62         }
63     };
64 
65     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
66         @Override
67         public void onReceive(Context context, Intent intent) {
68             // Broadcast receiver is always running on the UI thread here,
69             // so we don't need consider thread synchronization.
70             int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
71             handleStateChanged(state);
72         }
73     };
74 
BluetoothEnabler(Context context, SwitchBar switchBar)75     public BluetoothEnabler(Context context, SwitchBar switchBar) {
76         mContext = context;
77         mSwitchBar = switchBar;
78         mSwitch = switchBar.getSwitch();
79         mValidListener = false;
80 
81         LocalBluetoothManager manager = LocalBluetoothManager.getInstance(context);
82         if (manager == null) {
83             // Bluetooth is not supported
84             mLocalAdapter = null;
85             mSwitch.setEnabled(false);
86         } else {
87             mLocalAdapter = manager.getBluetoothAdapter();
88         }
89         mIntentFilter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
90     }
91 
setupSwitchBar()92     public void setupSwitchBar() {
93         mSwitchBar.show();
94     }
95 
teardownSwitchBar()96     public void teardownSwitchBar() {
97         mSwitchBar.hide();
98     }
99 
resume(Context context)100     public void resume(Context context) {
101         if (mLocalAdapter == null) {
102             mSwitch.setEnabled(false);
103             return;
104         }
105 
106         if (mContext != context) {
107             mContext = context;
108         }
109 
110         // Bluetooth state is not sticky, so set it manually
111         handleStateChanged(mLocalAdapter.getBluetoothState());
112 
113         mSwitchBar.addOnSwitchChangeListener(this);
114         mContext.registerReceiver(mReceiver, mIntentFilter);
115         mValidListener = true;
116     }
117 
pause()118     public void pause() {
119         if (mLocalAdapter == null) {
120             return;
121         }
122 
123         mSwitchBar.removeOnSwitchChangeListener(this);
124         mContext.unregisterReceiver(mReceiver);
125         mValidListener = false;
126     }
127 
handleStateChanged(int state)128     void handleStateChanged(int state) {
129         switch (state) {
130             case BluetoothAdapter.STATE_TURNING_ON:
131                 mSwitch.setEnabled(false);
132                 break;
133             case BluetoothAdapter.STATE_ON:
134                 setChecked(true);
135                 mSwitch.setEnabled(true);
136                 updateSearchIndex(true);
137                 break;
138             case BluetoothAdapter.STATE_TURNING_OFF:
139                 mSwitch.setEnabled(false);
140                 break;
141             case BluetoothAdapter.STATE_OFF:
142                 setChecked(false);
143                 mSwitch.setEnabled(true);
144                 updateSearchIndex(false);
145                 break;
146             default:
147                 setChecked(false);
148                 mSwitch.setEnabled(true);
149                 updateSearchIndex(false);
150         }
151     }
152 
setChecked(boolean isChecked)153     private void setChecked(boolean isChecked) {
154         if (isChecked != mSwitch.isChecked()) {
155             // set listener to null, so onCheckedChanged won't be called
156             // if the checked status on Switch isn't changed by user click
157             if (mValidListener) {
158                 mSwitchBar.removeOnSwitchChangeListener(this);
159             }
160             mSwitch.setChecked(isChecked);
161             if (mValidListener) {
162                 mSwitchBar.addOnSwitchChangeListener(this);
163             }
164         }
165     }
166 
updateSearchIndex(boolean isBluetoothOn)167     private void updateSearchIndex(boolean isBluetoothOn) {
168         mHandler.removeMessages(EVENT_UPDATE_INDEX);
169 
170         Message msg = new Message();
171         msg.what = EVENT_UPDATE_INDEX;
172         msg.getData().putBoolean(EVENT_DATA_IS_BT_ON, isBluetoothOn);
173         mHandler.sendMessage(msg);
174     }
175 
176     @Override
onSwitchChanged(Switch switchView, boolean isChecked)177     public void onSwitchChanged(Switch switchView, boolean isChecked) {
178         // Show toast message if Bluetooth is not allowed in airplane mode
179         if (isChecked &&
180                 !WirelessSettings.isRadioAllowed(mContext, Settings.Global.RADIO_BLUETOOTH)) {
181             Toast.makeText(mContext, R.string.wifi_in_airplane_mode, Toast.LENGTH_SHORT).show();
182             // Reset switch to off
183             switchView.setChecked(false);
184         }
185 
186         if (mLocalAdapter != null) {
187             mLocalAdapter.setBluetoothEnabled(isChecked);
188         }
189         mSwitch.setEnabled(false);
190     }
191 }
192